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Datolite

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Formula:
Ca(HBSiO5)
System:
Monoclinic
Colour:
White, greyish, pale ...
Lustre:
Vitreous, Resinous
Hardness:
5 - 5½
Name:
Named in 1806 by Jens Esmark from the Greek δατεῖσθαι for "to divide", in reference to the granular texture of massive varieties.
Gadolinite-Datolite Group. (See also Anchi-Zeolite)

The structure of datolite consists of sheets of four- and eight-membered rings of corner-sharing, alternating (HBO4) and (SiO4) tetrahedra, classifying it as a phyllo-borosilicate. The net formula of the anion is (HBSiO5)n, with (HBSiO5) as the repeating unit (Foit et al., 1973). Instead of (HBSiO5), the formula may also be written as (BSiO4OH) or (BSiO4(OH)), indicating that the proton is bonded to one of the oxygen atoms. The mineral does not contain any isolated hydroxide ions, though.

Compare also the closely related Bakerite and Shimazakiite.

Visit gemdat.org for gemological information about Datolite.

Classification of Datolite

Approved, 'Grandfathered' (first described prior to 1959)
9.AJ.20

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.2.1a.1

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination
17.5.10

17 : Silicates Containing other Anions
5 : Borosilicates
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Type Occurrence of Datolite

Occurrences of Datolite

Geological Setting:
Secondary mineral in mafic igneous rocks. Geodes in tuff, limestone skarns, serpentinites, schists, ore veins.

Physical Properties of Datolite

Vitreous, Resinous
Diaphaneity (Transparency):
Transparent, Translucent, Opaque
Colour:
White, greyish, pale green, red, yellow, etc.
Streak:
White
Hardness (Mohs):
5 - 5½
Tenacity:
Brittle
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.96 - 3 g/cm3 (Measured)    3 g/cm3 (Calculated)

Crystallography of Datolite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 9.62Å, b = 7.6Å, c = 4.84Å
β = 90.15°
Ratio:
a:b:c = 1.266 : 1 : 0.637
Unit Cell Volume:
V 353.86 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Short prismatic, lenticular, botryoidal, granular to compact, cryptocrystalline.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Datolite

Type:
Biaxial (-)
RI values:
nα = 1.626 nβ = 1.653 - 1.654 nγ = 1.670
2V:
Measured: 74° , Calculated: 72° to 74°
Max Birefringence:
δ = 0.044
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
weak r > v

Chemical Properties of Datolite

Formula:
Ca(HBSiO5)
Common Impurities:
Mn,Mg,Al,Fe

Relationship of Datolite to other Species

Other Members of Group:
BakeriteCa4(H5B5Si3O20)
Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
Gadolinite-(Y)Y2Fe2+Be2Si2O10
Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
HomiliteCa2(Fe2+,Mg)B2Si2O10
Minasgeraisite-(Y)CaBe2Y2Si2O10
Group Members:
UM1963-05-SiO:BeHREEY (REE,Ca)2Be2Si2O8(OH)2
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4
9.AJ.20BakeriteCa4(H5B5Si3O20)
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14
9.AJ.40JadariteLiNaSiB3O7(OH)
17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8
17.5.2ReedmergneriteNaBSi3O8
17.5.3SearlesiteNa(H2BSi2O7)
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.6KalborsiteK6Al4BSi6O20(OH)4Cl
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2
17.5.8PoudretteiteKNa2B3Si12O30
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.11DanburiteCaB2Si2O8
17.5.12HowliteCa2B5SiO9(OH)5
17.5.13BakeriteCa4(H5B5Si3O20)
17.5.14OyeliteCa10Si8B2O29 · 12.5H2O
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)(Ca,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)Ce5(SiO4,BO4)3(OH,O)
17.5.23Tritomite-(Y)Y5(SiO4,BO4)3(O,OH,F)
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.28 Ferridravite
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OH
17.5.30UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
17.5.33LeucospheniteBaNa4Ti2B2Si10O30
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2Cl
17.5.37Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
17.5.41Axinite
17.5.42Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
17.5.44SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.45Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2

Other Names for Datolite

Name in Other Languages:
Dutch:Datoliet
Italian:Datolite
Lithuanian:Datolitas
Simplified Chinese:硅硼钙石
Spanish:Datolita
Swedish:Datolit
Traditional Chinese:矽硼鈣石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Datolite

Reference List:
Klaproth, M.H. (1806) Chemische Untersuchung des Datoliths. Neues allgemeines Journal der Chemie. 6, 107-110

Klaproth, M.H. (1807) Chemische Untersuchung des Datoliths. Beiträge zur chemischen Kenntniss der Mineralkörper, Vierter Band, Rottmann Berlin, 354-359

Hausmann, J.F.L (1810) Bermerkungen über den Datolith, von der Nödebroe-Grube bei Arendal in Norwegen. Beiträge zur Naturkunde, 2, 59-67

Anderson, C. (1906) Mineralogical Notes: No. III - Axinite, petterdite, crocoite, datolite. Records of the Australian Museum: 6(3), 133-144.

Foit, Jr., F.F., Phillips, M.W., and Gibbs, G.V. (1973) A Refinement of the Crystal Structure of Datolite, CaBSiO4(OH). American Mineralogist 58, 909-914.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Bellatreccia, F., Cámara, F., Della Ventura, G. (2006) Datolite: a new occurrence in volcanic ejecta (Pitigliano, Toscana, Italy) and crystal-structure refinement. Rendiconti dell'Accademia Nazionale dei Lincei, Scienze Fisiche e Naturali, Serie 9, 17, 289-298.

Rocks & Minerals (2010) 85:338-345

Internet Links for Datolite

Specimens:
The following Datolite specimens are currently listed for sale on minfind.com.

Localities for Datolite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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